C/C++[微小位元][數字&數字]

最近，因為面試的關係，想把一些東西弄清楚，所以做了一些測試:
以下是微小位元的測試，實際是就是二進位運算啦，考是算錯(怪怪)

#include<stdio.h>

int main(void){
  int a = 44;
  int b = 55;
  int c = 33;
  int d = -20;
  printf("uni-micro operator: \n");
  printf("a & b = %d\n", a & b);
  printf("b & c = %d\n", b & c);
  printf("c & d = %d\n", c & d);
  printf("b & b = %d\n", b & b);
  printf("a | b = %d\n", a | b);

  printf("double-micro operator: \n");
  printf("a && b = %d\n", a && b);
  printf("a || b = %d\n", a || b);

  printf("while-micro operator: \n");
  while( a & b){
   printf("a ^ b = %d, ", a ^ b);
   a--;
   if(a < 40){
    break;
   }
  }
  printf("\n");
  while( a ^ d){
     printf("a ^ d = %d, ", a ^ d);
     a--;
     if( a ^ d < 0){
      break;
     }
  }

  return 0;
}

結果:

uni-micro operator: 
a & b = 36
b & c = 33
c & d = 32
b & b = 55
a | b = 63
double-micro operator: 
a && b = 1
a || b = 1
while-micro operator: 
a ^ b = 27, a ^ b = 28, a ^ b = 29, a ^ b = 30, a ^ b = 31, 
a ^ d = -53, 

由結果知道，while迴圈對負號的數值也會進入迴圈跑，我之前已為負的就不會跑= ="
學習中...